Hydraulic Brake Assist; Vdc Signals; Warning Light Functions - Alfa Romeo 159 Training Material

BRAKING SYSTEM

Hydraulic Brake Assist

This function assists panic braking. In the event of panic braking, detected by measuring the brake pedal application
speed (on the basis of the oil pressure signal inside the electro-hydraulic unit) the system automatically and rapidly
increases braking pressure. This function increases deceleration in the event of panic braking and reduces the
braking system response time. The system is classified as a brake assist system (BAS) in accordance with
international classifications.

VDC signals

The VDC system signals operation by flashing the instrument panel warning light (5Hz DC 50%) and by showing a
message on the instrument panel display (on models where fitted).

Warning light functions

1. VDC warning light
2. EBD/parking brake warning light
3. ABS warning light
The ABS ECU runs system self-diagnostics. In the event of a failure, it transmits the concerned function code to the
NQS on the serial line to:
deactivate the entire system
deactivate part of the system.
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